Pulumi CLI documentation lacks information on pulumi ai

[scottslowe]

Problem description

A community user pointed out that the Pulumi CLI documentation (https://www.pulumi.com/docs/cli/) lacks any documentation on the pulumi ai command (the user specifically referenced pulumi ai web).

Affected product version(s)

This should only affect the CLI versions that include pulumi ai commands.

Suggestions for a fix

We just need to add pulumi ai to the CLI page with appropriate explanation/details.